| AWGN信道下LDPC码的译码算法研究 |
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| 引用本文： | 袁建国,仝青振,黄胜,王永.AWGN信道下LDPC码的译码算法研究[J].半导体光电,2013,34(4):642-644,648. |
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| 作者姓名： | 袁建国 仝青振 黄胜 王永 |
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| 作者单位： | 重庆邮电大学光纤通信技术重点实验室,重庆,400065 |
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| 基金项目： | 国家自然科学基金项目（61071117, 61275077, 61003256）；重庆市自然科学基金（2010BB2409）；重庆市教委项目（KJ110519）. |
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| 摘 要： | 在高斯白噪声(AWGN)信道情况下,针对LDPC码的译码算法进行深入分析后,对适用于低密度奇偶校验(LDPC)码的硬判决译码算法与软判决译码算法进行了仿真与对比分析,并通过引入乘性校正因子以降低软判决算法中对数域置信传播(LLR-BP)算法的变量消息相关性。仿真分析表明改进后的LLR-BP算法与原算法相比,在几乎不增加计算复杂度的情况下,其译码纠错性能得到了明显的改善。因而改进后的LLR-BP算法具有明显的优越性。
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| 关 键 词： | 低密度奇偶校验码 比特翻转 置信传播 比特误码率 净编码增益 |
| 收稿时间： | 4/2/2013 12:00:00 AM |
Study on Decoding Algorithm for LDPC Codes under AWGN Channel |
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| YUAN Jianguo,TONG Qingzhen,HUANG Sheng,WANG Yong.Study on Decoding Algorithm for LDPC Codes under AWGN Channel[J].Semiconductor Optoelectronics,2013,34(4):642-644,648. |
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| Authors: | YUAN Jianguo TONG Qingzhen HUANG Sheng WANG Yong |
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| Affiliation: | (Key Lab.of Optical Fiber Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,CHN) |
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| Abstract: | Under the condition of the Additive White Gaussian Noise (AWGN) channel, both the hard and soft decision decoding algorithms suitable for LDPC codes are simulated and comparatively analyzed based on analyzing the decoding algorithm for LDPC codes. The variable message correlation for Log-Likelihood-Ratio Belief-Propagation (LLR-BP) algorithm in soft decision algorithm is decreased by introducing a multiplicative correction factor. The simulation results show that the decoding error-correction performance of the modified LLR-BP algorithm is greatly improved with little increase of computing complexity. |
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| Keywords: | LDPC codes bit-flipping belief-propagation bit error rate(BER) net coding gain(NCG) |
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